JP7344530B2 - sheet - Google Patents

Description

The present invention relates to a seat equipped with a sensor that detects the load of an occupant.

2. Description of the Related Art Conventionally, it has been known to detect whether a passenger is seated in a seat for the purpose of controlling various safety devices such as seat belts installed in a vehicle. For example, Patent Document 1 discloses an example of a seat equipped with a load detection device for detecting whether an occupant is seated. In the seat described in Patent Document 1, the sensor main body of the load detection device is provided between an intermediate position in the thickness direction of a pad member constituting the seat seat and the lower surface.

Japanese Patent Application Publication No. 2014-172511

In the seat described in Patent Document 1, when the seated occupant is a lightweight person such as a child, the amount of deformation of the seat surface when the seated occupant is seated is small, and the load applied to the sensor body is small. There has been a problem in that it may not be possible to detect whether the person is sitting.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a seat that can more accurately detect whether an occupant is seated on the seat.

A seat according to one aspect of the present invention includes a cushion member that has a seat side surface and constitutes a seat portion, and a sensor that is attached to the cushion member and detects the load of an occupant, A recess is formed on the side surface, the recess being located on the side of the area where the sensor is arranged, extending from the seat side surface in the thickness direction of the cushion member, and having a lower end located below the position of the sensor. The recess includes a first recess and a second recess that extend linearly and parallel to each other along the depth direction of the sheet at positions on both sides of the area where the sensor is disposed in the width direction of the sheet; The first recess and the second recess are provided only at a position in front of the area where the sensor is arranged in the depth direction of the sheet and extend linearly along the width direction of the sheet, and the first recess and the second recess in the depth direction of the sheet. and a third recess that connects the front ends of the recesses .

In the present invention, "the side of the area where the sensor is placed" includes both the side in the width direction of the area where the sensor is placed and the side in the depth direction of the area where the sensor is placed. shall be included.

In this seat, a concave portion is located on the side of the area where the sensor is arranged, extends from the seat side surface in the thickness direction of the cushion member, and has a lower end located below the sensor position. is formed. Therefore, when a load is applied to the seat surface side surface of the cushion member when an occupant sits on the seat, the region of the cushion member where the sensor is disposed tends to deform. Therefore, the load applied when the occupant is seated is easily transmitted to the sensor, and therefore, according to this seat, even if the load applied when the occupant is seated is small, it is possible to accurately detect that the occupant is seated.

In this seat, it is preferable that the cushion member has a seat-side surface layer portion including the seat-side surface, and the sensor is disposed on the seat-side surface layer portion.

In this case, the recess can be made shallow while maintaining high detection sensitivity for occupant seating. Therefore, it is possible to achieve both high detection sensitivity and excellent seating comfort for the seating of the occupant.

In this seat, the recess has a distance in the thickness direction of the cushion member from the lower end of the sensor to the lower end of the recess in the width direction of the seat from a predetermined seating center of the occupant on the seat side surface. It is preferable that the width be 5% or more and 45% or less of the distance along the width direction to the outermost end of the sensor in .

The distance along the thickness direction of the cushion member from the lower end of the sensor to the lower end of the recess is the distance along the width direction from the predetermined seating center of the occupant on the seat side surface to the outermost edge of the sensor in the width direction of the seat. By forming the recess so that the distance is 5% or more of the distance, the amount of deformation of the region of the cushion member where the sensor is arranged can be increased. Therefore, the load that is applied when the occupant is seated is easily transmitted to the sensor, and it is therefore possible to detect with higher accuracy that the occupant is seated.

The distance along the thickness direction of the cushion member from the lower end of the sensor to the lower end of the recess is the distance along the width direction from the predetermined seating center of the occupant on the seat side surface to the outermost edge of the sensor in the width direction of the seat. By forming the recess so that the distance is 45% or less of the distance between the seat and the seat, the comfort of the seat can be improved.

Further, as a specific numerical value, the recessed portion may be formed such that the distance along the thickness direction of the cushion member from the lower end of the sensor to the lower end of the recessed portion is in the range of 3 mm or more and 10 mm or less. preferable.

By forming the recess so that the distance along the thickness direction of the cushion member from the lower end of the sensor to the lower end of the recess is 3 mm or more, the amount of deformation of the area of the cushion member where the sensor is arranged can be increased. can. Therefore, the load that is applied when the occupant is seated is easily transmitted to the sensor, and it is therefore possible to detect with higher accuracy that the occupant is seated.

By forming the recess so that the distance along the thickness direction of the cushion member from the lower end of the sensor to the lower end of the recess is 10 mm or less, the comfort of the seat can be improved.

In this seat, the recessed portion is located within a contact area between the human body model AM50 and the seat seat defined when the human body model AM50 is seated relative to a predetermined seating center of the seat seat. It is preferable that it be formed so as to.

In this case, since the area of the area located closer to the sensor than the recess on the seat side surface can be made smaller, the area per unit area added to the area located closer to the sensor than the recess on the seat side surface when the occupant is seated is The load can be increased. Therefore, the amount of deformation of the region of the cushion member where the sensor is arranged can be increased, and the load applied when the occupant is seated can be more easily transmitted to the sensor. Therefore, it becomes possible to detect with higher accuracy that the occupant is seated.

According to the present invention, it is possible to provide a seat that can more accurately detect that an occupant is seated.

FIG. 1 is a plan view showing a sheet according to an embodiment of the present invention. FIG. 3 is a plan view showing a sensor provided on the sheet. 2 is a sectional view taken along line III-III in FIG. 1. FIG. 2 is a sectional view taken along the line IV-IV in FIG. 1. FIG. FIG. 2 is a sectional view taken along the line III-III in FIG. 1, showing how the seat portion deforms when a load is applied to the seat surface of the seat. FIG. 2 is a sectional view taken along line IV-IV in FIG. 1, showing how the seat portion deforms when a load is applied to the seat surface of the seat. It is a top view which shows a part of sheet|seat based on the 1st modification. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. FIG. 8 is a sectional view taken along line IX-IX in FIG. 7. FIG. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7, showing how the seat portion deforms when a load is applied to the seat surface of the seat according to the first modification. FIG. 8 is a cross-sectional view taken along line IX-IX in FIG. 7, showing how the seat portion deforms when a load is applied to the seat surface of the seat according to the first modification. It is a top view which shows a part of sheet|seat based on the 2nd modification. 13 is a sectional view taken along line XIII-XIII in FIG. 12. FIG. 13 is a sectional view taken along line XIV-XIV in FIG. 12. FIG. FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12, showing how the seat portion deforms when a load is applied to the seat surface of the seat according to the second modification. FIG. 13 is a sectional view taken along the line XIV-XIV in FIG. 12, showing how the seat portion deforms when a load is applied to the seat surface of the seat according to the second modification. FIG. 2 is a cross-sectional view showing an outline of a load-bearing experiment conducted in an example. It is a top view which shows the measurement point of the displacement amount in the thickness direction of the cushion member in an Example.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a plan view showing a sheet 1 according to an embodiment of the present invention. FIG. 2 is a plan view showing a sensor provided on the seat 1. FIG. 3 is a cross-sectional view taken along line III--III in FIG. FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. The seat 1 shown in FIG. 1 is a seat that can be installed in general vehicles such as automobiles and trains. This seat is particularly suitable for use in vehicles where it is necessary to detect whether a passenger is seated.

The seat 1 includes a seat portion 2 having a seat surface 2a (see FIGS. 3 and 4) on which an occupant sits, and a backrest portion extending upward from the rear end of the seat portion 2 in the depth direction T. (not shown). As shown in FIGS. 3 and 4 showing cross sections of the seat portion 2, the seat portion 2 includes a cushion member 10 having a seat surface side surface 10a located on the seat surface 2a side, and a surface of the cushion member 10. It has a trim (skin) 20 (not shown in FIG. 1) that covers at least a portion of it. The cushion member 10 is made of an elastic material. Therefore, the cushion member 10 is elastically deformable. Preferred specific examples of the elastic material constituting the cushion member 10 include resins such as polyurethane.

As shown in FIGS. 1 to 4, a sensor 30 is attached to the cushion member 10 to detect the load of an occupant. Specifically, as shown in FIGS. 2 and 3, a flexible sheet-like sensor 30 is arranged on the seat side surface 10a of the cushion member 10.

The sensor 30 is disposed at a position overlapping the seating center C of the seat portion 2 when viewed from the thickness direction H of the cushion member 10. In other words, the sensor 30 is arranged such that the seating center C is located within the area where the sensor 30 is provided when viewed from the thickness direction H of the cushion member 10.

Here, the "seating center" is the centroid of the contact surface between the occupant seated on the seat and the seat seat portion, and is predetermined at the time of designing the seat.

The sensor 30 is a sensor that detects the load of the occupant, and in this embodiment, a membrane type sensor is employed.

As shown in FIG. 2, in this embodiment, the sensor 30 includes four detection sections 31a to 31d that detect loads, wiring 32 connected to each of the four detection sections 31a to 31d, and a flexible A pair of holding films 33 are provided. The pair of holding films 33 are attached to each other, and the four detection parts 31a to 31d and the wiring 32 are arranged between the pair of holding films 33.

A recess 11 is formed in the seat side surface 10a of the cushion member 10, which is located on the side of the area where the sensor 30 is arranged. The recess 11 is formed around the area where the sensor 30 is arranged. As shown in FIG. 1, the recess 11 is a contact area between the human body model AM50 and the seat portion 2 defined when the human body model AM50 (not shown) is seated relative to the seating center C of the seat portion 2. It is formed to be located within A.

Here, the "human body model AM50" refers to a human body model (human body dummy) with a size corresponding to 50% of American adult males, counting from the smallest.

The recess 11 includes a first recess 11a located on one side of the sensor 30 in the width direction W and extending along the depth direction T, and a first recess 11a located on the other side of the sensor 30 in the width direction W and extending along the depth direction T. a second recessed portion 11b extending along the depth direction T, a third recessed portion 11c extending along the width direction W, and a third recessed portion 11c located on the other side of the sensor 30 in the depth direction T; , and a fourth recessed portion 11d extending along the width direction W. The first to fourth recessed portions 11a to 11d are each formed in a straight line. The first and second recessed portions 11a and 11b are formed parallel to each other along the depth direction T, respectively. The third and fourth recessed portions 11c and 11d are formed parallel to each other along the width direction W, respectively. The first and second recessed portions 11a and 11b extend further to one side (outer side) than one side end in the depth direction T of the sensor 30, and further to the other side (outer side) than the other side end, respectively. It is formed. The third and fourth recessed portions 11c and 11d extend further to one side (outer side) than one side end in the width direction W of the sensor 30, and to the other side (outer side) further than the other side end, respectively. It is formed. One end of the first recessed portion 11a in the depth direction T and one end of the second recessed portion 11b in the depth direction T are connected by a third recessed portion 11c. On the other hand, the other end of the first recessed portion 11a in the depth direction T and the other end of the second recessed portion 11b in the depth direction T are connected by a fourth recessed portion 11d. Therefore, in this embodiment, the recess 11 is formed in a shape that surrounds the area where the sensor 30 is provided.

As shown in FIGS. 3 and 4, the recess 11 has a substantially U-shaped cross-sectional shape along the width direction that gradually becomes narrower toward the tip side (lower end side) of the recess 11. It is formed.

The recess 11 is formed so as to extend from the seat side surface 10a in the thickness direction H of the cushion member 10 and have a lower end (tip) located below the position of the sensor 30 when no occupant is seated. . Specifically, in the recess 11, the distance L1 from the lower end of the sensor 30 to the lower end of the recess 11 along the thickness direction H is the outermost part of the sensor 30 in the width direction W from the seating center C of the occupant on the seat side surface 10a. It is formed so that it is 5% or more and 45% or less of the distance L0 (see FIG. 2) along the width direction W to the end. In this embodiment, the recess 11 is specifically formed so that the distance L1 along the thickness direction H from the lower end of the sensor 30 to the lower end of the recess 11 is in the range of 3 mm or more and 10 mm or less.

As explained above, in this seat 1, the area surrounding the sensor 30 is placed on the seat surface 10a of the cushion member 10, and extends from the seat surface 10a in the thickness direction H of the cushion member 10 to the lower end. A recess 11 is formed in which the position of the sensor 30 is lower than the position of the sensor 30 . According to this configuration, deformation of the region of the cushion member 10 surrounded by the recess 11 and in which the sensor 30 is arranged is less likely to be restrained by the portion located outside the region. Therefore, the area of the cushion member 10 surrounded by the recess 11 and where the sensor 30 is disposed is likely to be deformed. Therefore, the load applied when the occupant is seated is easily transmitted to the sensor 30. Therefore, according to the seat 1, it is possible to accurately detect that the occupant is seated even when the load applied when the occupant is seated is small, such as when the occupant is a lightweight child. .

In the seat 1, the recess 11 is located within a contact area A between the human body model AM50 and the seat seat 2, which is defined when the human body model AM50 is seated relative to the seating center C of the seat seat 2. It is formed. According to this configuration, the area of the area of the seat side surface 10a located closer to the sensor 30 than the recess 11 (the area surrounded by the recess 11) can be made smaller than the area of the seat side surface 10a. When the occupant is seated, it is possible to increase the load per unit area that is applied to the region of the seat side surface 10a located closer to the sensor 30 than the recess 11. Therefore, the amount of deformation of the region of the cushion member 10 where the sensor 30 is arranged can be increased, and the load applied when the occupant is seated can be more easily transmitted to the sensor. Therefore, with this configuration, it is possible to detect with higher accuracy that the occupant is seated.

In this seat 1, a sensor 30 is arranged on the seat side surface 10a. According to this configuration, the distance between the occupant seated on the seat 1 and the sensor 30 can be shortened, so that the load can be easily transmitted to the sensor 30. Therefore, it is possible to more accurately detect that the occupant is seated.

In this seat 1, the distance L1 along the thickness direction H of the cushion member 10 from the lower end of the sensor 30 to the lower end of the recess 11 is from the seating center C on the seat side surface 10a to the outermost end of the sensor 30 in the width direction W. The recessed portion 11 is formed so as to have a distance of 5% or more of the distance L0 along the width direction W. Specifically, the recess 11 is formed such that the distance L1 along the thickness direction H from the lower end of the sensor 30 to the lower end of the recess 11 is 3 mm or more.

According to this configuration, the amount of deformation of the region of the cushion member 10 where the sensor 30 is arranged can be increased. Therefore, the load that is applied when the occupant is seated is easily transmitted to the sensor 30, and it is therefore possible to detect with higher accuracy that the occupant is seated.

From the viewpoint of further increasing the amount of deformation of the region of the cushion member 10 where the sensor 30 is arranged, the recess 11 is preferably formed such that the distance L1 is 10% or more of the distance L0. Preferably, the recess 11 is formed such that the distance L1 is 5 mm or more.

In this sheet 1, the recesses 11 are formed such that the distance L1 is 45% or less of the distance L0. Specifically, the recess 11 is formed such that the distance L1 is 10 mm or less.

According to this configuration, since the recess 11 can be made shallow, the seat 1 can provide excellent sitting comfort.

From the viewpoint of achieving better sitting comfort on the seat 1, it is preferable to form the recess 11 so that the distance L1 is 30% or less of the distance L0. Specifically, it is preferable to form the recess 11 so that the distance L1 is 10 mm or less.

Note that, depending on the detection sensitivity required for the sensor, the distance L1 from the lower end of the sensor 30 to the lower end of the recess 11 along the thickness direction H of the cushion member 10 is set within a range of 5% to 45% of the distance L0. It can be selected as appropriate.

[Modified example]
Modifications of the above embodiment will be described below. In the following description, members having substantially the same functions as those in the above embodiment will be referred to by common reference numerals, and the description will be omitted.

In the above embodiment, an example has been described in which the recess 11 is formed to surround the sensor 30, but the present invention is not limited to this configuration. The recess 11 may be formed so as not to surround the sensor 30. For example, the first and second recessed portions 11a and 11b and the third and fourth recessed portions 11c and 11d may be formed independently and separated from each other. Moreover, the recessed part 11 may be configured as in the following first and second modified examples, for example.

(First modification)
FIG. 7 is a plan view showing a portion of the seat according to the first modification. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. FIGS. 10 and 11 are cross-sectional views showing how the seat portion deforms when a load is applied to the seat surface of the seat according to the first modification.

In the first modification, as shown in FIGS. 7 to 9, the recesses 11 are formed on both sides of the sensor 30 in the width direction W and at the front in the depth direction T. The recess 11 is not formed at the rear of the sensor 30 in the depth direction T. The recessed portion 11 is formed into a substantially U-shape when viewed from the thickness direction H of the cushion member 10. The recessed portion 11 includes a first recessed portion 11a located on one side of the sensor 30 in the width direction W and extending along the depth direction T, and a first recessed portion 11a located on the other side of the sensor 30 in the width direction W and extending along the depth direction T. The third recessed portion 11d is located in front of the sensor 30 in the depth direction T and extends along the width direction W. The front end of the first recessed portion 11a in the depth direction T and the front end of the second recessed portion 11b in the depth direction T are connected by a third recessed portion 11d.

As shown in FIGS. 7 to 9, similarly to the above embodiment, in the first modification, a recess 11 located on the side of the area where the sensor 30 is arranged is formed in the seat surface 10a. There is. In this modification, the recess 11 includes a portion extending along the depth direction T on both sides of the sensor 30 in the width direction W, and a portion extending along the width direction W in front of the sensor 30 in the depth direction T. Therefore, the deformation of the region where the sensor 30 is arranged is less likely to be restrained by both side portions in the width direction W and the front portion in the depth direction T of the region. Therefore, as shown in FIGS. 10 and 11, the region in which the sensor 30 is arranged is easily deformed to a large extent, making it possible to accurately detect whether the occupant is seated.

(Second modification)
FIG. 12 is a plan view showing a portion of the seat according to the second modification. FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12. FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. 12. FIGS. 15 and 16 are cross-sectional views showing how the seat portion deforms when a load is applied to the seat surface of the seat according to the second modification.

In the second modification, as shown in FIGS. 12 to 14, the recesses 11 are formed on both sides of the sensor 30 in the width direction W. Specifically, the recessed portion 11 includes a first recessed portion 11a located on one side of the sensor 30 in the width direction W and extending along the depth direction T, and a first recessed portion 11a located on the other side of the sensor 30 in the width direction W and extending along the depth direction T. and a second recessed portion 11b extending along the direction T.

As shown in FIGS. 12 to 14, similarly to the above embodiment, in the second modification, a recess 11 located on the side of the area where the sensor 30 is arranged is formed in the seat surface 10a. There is. In this modification, the recess 11 includes portions extending along the depth direction T on both sides of the sensor 30 in the width direction W. Therefore, the deformation of the region where the sensor 30 is arranged is less likely to be restrained by both side portions of the region in the width direction W. Therefore, as shown in FIGS. 15 and 16, the area where the sensor 30 is arranged is easily deformed to a large extent, and it is therefore possible to accurately detect whether the occupant is seated.

(Other variations)
In the second modification, an example has been described in which the recess 11 is constituted by the first and second recess portions 11a and 11b located laterally in the width direction W with respect to the sensor 30. For example, it may be configured by at least one of the third and fourth recessed portions 11c and 11d located on the side of the sensor 30 in the depth direction T.

According to this configuration, the deformation of the region where the sensor 30 is arranged is less likely to be restrained by the portion located on the side of the region in the depth direction T. Therefore, in this configuration as well, the area where the sensor 30 is arranged is easily deformed to a large extent, making it possible to accurately detect whether the occupant is seated.

In this way, when the recess 11 is formed on the side of the area where the sensor 30 is arranged, the deformation of the area is less likely to be restrained by the area adjacent to the area with the recess 11 in between. Therefore, if the recess 11 is formed on the side of the area where the sensor 30 is arranged, it is possible to accurately detect the occupant's seating, regardless of the plan view shape or cross-sectional shape of the recess 11. Become.

For example, the first and second recessed portions 11a and 11b of the recessed portion 11 may be formed along a direction inclined with respect to the depth direction T, respectively. The third and fourth recessed portions 11c and 11d of the recessed portion 11 may be formed along a direction inclined with respect to the width direction W, respectively.

The first to fourth recessed portions 11a to 11d may each be formed in a non-linear shape. Each of the first to fourth recessed portions 11a to 11d may be formed, for example, in a meandering or curved shape.

The recessed portion 11 may be formed in a dot shape.

The recess 11 may be formed, for example, so that its cross-sectional shape is rectangular, inverted triangular, inverted trapezoidal, or the like.

In the embodiment described above, an example has been described in which the sensor 30 is disposed on the seat surface side surface 10a, but the sensor 30 may be embedded, for example, in the seat surface side surface layer portion 10b. Also in this configuration, the sensor 30 is arranged by forming the recess 11 so as to extend from the seat side surface 10a in the thickness direction H of the cushion member 10 and having a lower end located below the position of the sensor 30. The deformation of the region is less likely to be restrained by the portions located on the sides of the region. Therefore, it becomes possible to accurately detect whether the occupant is seated.

In the embodiment described above, an example in which the sensor 30 is configured by a membrane type sensor has been described. However, in the present invention, the sensor may be any sensor that can detect the load of the occupant. The sensor 30 can also be configured by, for example, a strain gauge, a sensor using a piezoelectric element, or the like.

In the above embodiment, an example has been described in which the sensor 30 has four detection sections 31a to 31d, but in the present invention, the sensor only needs to have at least one detection section, for example, one detection section. It may be constituted by a detection section.

The seat portion 2 does not have the trim (skin) 20 and may be configured with the cushion member 10, for example.

The seat 1 may not have a backrest portion and may be constituted by a seat seat portion 2, for example.

[Comparative experiment]
The following example shows how the amount of displacement of the seat surface 10a changes when the seat surface 10a is pressed by forming the recess 11 on the seat surface 10a of the cushion member 10. An experiment was conducted using the sheet and the sheet according to the comparative example.

(Sheet according to the example)
The seat according to the example is a seat having substantially the same configuration as the seat 1 described in the above embodiment, and specifically includes a polyurethane cushion member 10 in which a recess 11 is formed, and a cushion member 10. This sheet includes a sheet-like sensor 30 having a width dimension of 80 mm and a depth dimension of 80 mm, which is attached within an area surrounded by the recess 11 on the seat surface side surface 10a of the seat surface 10a. In the seat, a recess 11 as described below is formed on the seat side surface 10a of the cushion member 10.

Depth of recess 11 (distance along thickness direction H of cushion member 10 between seat side surface 10a and tip of recess 11): 5 mm
Width of recess 11: 5mm
Distance along the width direction W between the first recessed part 11a and the second recessed part 11b of the recessed part 11: 90 mm
Distance along the depth direction T between the third recessed portion 11c and the fourth recessed portion 11d of the recessed portion 11: 100 mm

(Sheet related to comparative example)
The seat according to the comparative example has the same configuration as the seat according to the above example, except that no recess is formed on the seat side surface, and specifically, no recess is formed. This seat includes a cushion member made of polyurethane and a sheet-like sensor with a width dimension of 80 mm and a depth dimension of 80 mm attached to the seat side surface of the cushion member.

(experiment)
As shown in FIG. 17, a disk-shaped load plate 40 with a diameter of 80 mm is arranged so that its centroid coincides with the centroid of the sensor 30, and is pressed against the cushion member with a force of 196N. The amount of displacement of the seat side surface 10a was measured at each measurement point A-1 to C-4 and D shown in FIG. This measurement was repeated five times, and the average value of the displacement amount at each measurement point A-1 to C-4 and D was determined. Table 1 shows the results for the sheet according to the example, and Table 2 shows the results for the sheet according to the comparative example.

(Consideration)
From the results shown in Tables 1 and 2, it is understood that by forming the recess 11 on the seat surface 10a, the amount of displacement of the seat surface in the area surrounded by the recess 11 tends to increase. . This means that the difference in displacement (5.1 mm) between measurement point B-3 and measurement point D in the example in which the recess 11 was formed is the same as that in the comparison example in which the recess 11 was not formed. This is also supported by the fact that it was larger than the difference in displacement with measurement point D (4.2 mm). Furthermore, by forming the recess 11 on the seat side surface 10a, measurement points A-2, A-3, A-4, B-2, B-3, B located within the area surrounded by the recess 11 can be arranged. It is understood that the variation in the amount of displacement at -4, C-2, C-3, and C-4 can be reduced. From the above, it can be seen that by forming the recess 11 on the seat surface 10a of the cushion member 10, the amount of displacement of the area surrounded by the recess 11 on the seat surface 10a can be relatively stably increased.

1 Seat 2 Seat seat portion 2a Seat surface 10 Cushion member 10a Seat surface side surface 10b Seat surface side surface layer 11 Recessed portion 30 Sensor

Claims (5)

a cushion member having a seat side surface and forming a seat portion;
a sensor attached to the cushion member to detect the load of the occupant;
A recessed portion located on the side of the area where the sensor is disposed on the seat side surface, extends from the seat side surface in the thickness direction of the cushion member, and has a lower end located below the position of the sensor. is formed ,
The recess is
a first recess and a second recess that extend linearly and parallel to each other along the depth direction of the sheet at positions on both sides of the area where the sensor is arranged in the width direction of the sheet;
The first recess and the second recess are provided only at a position in front of the area where the sensor is arranged in the depth direction of the sheet and extend linearly along the width direction of the sheet, and the first recess and the second recess in the depth direction of the sheet. A sheet comprising: a third recess that connects the front ends of the recesses . The sheet according to claim 1,
The cushion member has a seat side surface layer portion including the seat side surface,
The seat is characterized in that the sensor is disposed on the seat surface side surface layer portion. The sheet according to claim 1 or 2 ,
The recessed portion is arranged such that the distance from the lower end of the sensor to the lower end of the recessed portion along the thickness direction of the cushion member is a distance of the sensor in the width direction of the seat from a predetermined seating center of the occupant on the seat side surface. A sheet characterized in that it is formed so as to be 5% or more and 45% or less of the distance along the width direction to the outermost edge. The sheet according to any one of claims 1 to 3 ,
The recessed portion is formed such that a distance along the thickness direction of the cushion member from a lower end of the sensor to a lower end of the recessed portion is in a range of 3 mm or more and 10 mm or less. The sheet according to any one of claims 1 to 4 ,
The recessed portion is formed to be located within a contact area between the human body model AM50 and the seat seat defined when the human body model AM50 is seated relative to a predetermined seating center of the seat seat. A sheet characterized by: